Why have you narrowed it down to coreupt and surface? Is it the shapes? Graphics? Prices?
You have to give us some information about yourself so we can help give you advice. What's your:
-Age
-Height
-Weight
-Ability level
-Style of skiing
Additionally, what area do you typically ski in? Are you looking for a versatile "do everything" powder ski, or something completely powder specific. I assume you're looking for something bidirectional, as you said you'll be hitting bc booters.
There are many many different types and varieties of skis out there, and we cant read minds. Fill us in!
Sincerely,
Isak
ps, Although I've never owned a surface ski (only demoed), there are some nasty rumors going around about their durability, so that might be something to watch out for. Also, I'm not such a fan of their 3-stage rocker, but you might end up liking it. Whatever people on here reccommend to you on here, I would definitely suggest demoing first, so that you don't end up with a pair of skis you don't like.
Cheers!